dt-bindings: iio: dac: add ad35xxr single output variants

Add support for ad3541r and ad3551r single output variants.
Signed-off-by: Angelo Dureghello <adureghello@baylibre.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20240522150141.1776196-3-adureghello@baylibre.orgSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/dac/adi,ad3552r.yaml

@@ -13,13 +13,17 @@ maintainers:
 description: |
   Bindings for the Analog Devices AD3552R DAC device and similar.
   Datasheet can be found here:
+    https://www.analog.com/media/en/technical-documentation/data-sheets/ad3541r.pdf
     https://www.analog.com/media/en/technical-documentation/data-sheets/ad3542r.pdf
+    https://www.analog.com/media/en/technical-documentation/data-sheets/ad3551r.pdf
     https://www.analog.com/media/en/technical-documentation/data-sheets/ad3552r.pdf
 
 properties:
   compatible:
     enum:
+      - adi,ad3541r
       - adi,ad3542r
+      - adi,ad3551r
       - adi,ad3552r
 
   reg:
@@ -128,7 +132,9 @@ allOf:
       properties:
         compatible:
           contains:
-            const: adi,ad3542r
+            enum:
+              - adi,ad3541r
+              - adi,ad3542r
     then:
       patternProperties:
         "^channel@([0-1])$":
@@ -158,7 +164,9 @@ allOf:
       properties:
         compatible:
           contains:
-            const: adi,ad3552r
+            enum:
+              - adi,ad3551r
+              - adi,ad3552r
     then:
       patternProperties:
         "^channel@([0-1])$":
@@ -182,6 +190,21 @@ allOf:
                     - const: -10000000
                     - const: 10000000
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - adi,ad3541r
+              - adi,ad3551r
+    then:
+      properties:
+        channel@1: false
+        channel@0:
+          properties:
+            reg:
+              const: 0
+
 required:
   - compatible
   - reg